protected void addStream(final MediaStream mediaStream) {
    DCHECK(mediaStream);
    DCHECK(pcExecutor);
    pcExecutor.execute(() -> {
        if (disposed()) {
            return;
        }
        ArrayList<String> streamIds = new ArrayList<>();
        streamIds.add(mediaStream.getId());
        for (AudioTrack audioTrack : mediaStream.audioTracks) {
            RtpSender audioSender = peerConnection.addTrack(audioTrack, streamIds);
            audioRtpSenders.put(mediaStream.getId(), audioSender);
        }
        for (VideoTrack videoTrack : mediaStream.videoTracks) {
            RtpSender videoSender = peerConnection.addTrack(videoTrack, streamIds);
            videoRtpSenders.put(mediaStream.getId(), videoSender);
        }
    });
}
 

private void setMaxBitrate(RtpSender sender, Integer bitrate) {
    if (sender == null) {
        return;
    }
    RtpParameters rtpParameters = sender.getParameters();
    if (rtpParameters == null) {
        Log.e(LOG_TAG, "Null rtp paramters");
        return;
    }
    for (RtpParameters.Encoding encoding : rtpParameters.encodings) {
        encoding.maxBitrateBps = bitrate == null ? null : bitrate * 1000;
    }
    if (!sender.setParameters(rtpParameters)) {
        Log.e(LOG_TAG, "Failed to configure max video bitrate");
    }
}
 

private void findVideoSender() {
  for (RtpSender sender : peerConnection.getSenders()) {
    if (sender.track() != null) {
      String trackType = sender.track().kind();
      if (trackType.equals(VIDEO_TRACK_TYPE)) {
        Log.d(TAG, "Found video sender.");
        localVideoSender = sender;
      }
    }
  }
}
 

private void findVideoSender(final BigInteger handleId) {
  PeerConnection peerConnection = peerConnectionMap.get(handleId).peerConnection;
  for (RtpSender sender : peerConnection.getSenders()) {
    if (sender.track() != null) {
      String trackType = sender.track().kind();
      if (trackType.equals(VIDEO_TRACK_TYPE)) {
        Log.d(TAG, "Found video sender.");
        localVideoSender = sender;
      }
    }
  }
}
 

private void findVideoSender() {
    for (RtpSender sender : peerConnection.getSenders()) {
        if (sender.track() != null) {
            String trackType = sender.track().kind();
            if (trackType.equals(VIDEO_TRACK_TYPE)) {
                Log.d(TAG, "Found video sender.");
                localVideoSender = sender;
            }
        }
    }
}
 

private void findVideoSender() {
  for (RtpSender sender : peerConnection.getSenders()) {
    if (sender.track() != null) {
      String trackType = sender.track().kind();
      if (trackType.equals(VIDEO_TRACK_TYPE)) {
        Log.d(TAG, "Found video sender.");
        localVideoSender = sender;
      }
    }
  }
}